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If your charming old windows or doors look ready for the scrapyard, think again!

Rotten, draughty, unsightly windows or doors? Our restoration service is tailored for you.


London Joinery Services explains the process of repair


If you love the period charm and heritage innate in your wooden sliding sash windows but hate the draughts, rattles, rot and heat loss that can also be part and parcel with an older property then you need help from the experts. With over many years’ experience repairing windows across the London, 

you can trust London Joinery Services.

The replacement of sash windows is, in many cases, completely unnecessary. There are very few instances where damage and decay cannot be repaired using the right knowledge and tools. Repair work will depend on the damage. Decaying timber, broken sash cords, damaged pulleys and broken glass, will all need replacing.


Traditional timber sash windows are an essential feature of a period buildings character. Therefore it is vital to retain them, not only because of the aesthetic appeal, but because they add value to your property. Also known as a sliding sash or vertical sliders, they rely on a weighted system that allows the heavy sashes to lift and fall with ease. In order for the sashes to move in the box and operate smoothly, there is a 3mm gap between the sash and the frame which is often the cause of draughts, rattles, dust and rain ingress and heat loss. 

Our service focuses firstly on window repair and secondly on upgrading their performance.


What happens during the renovation process?

  1. Windows are carefully removed from the window frame.

  2. if necessary The glass is removed and then the old putty can be scraped away.

  3. Any decaying timber in the units, frame or sill is routed out to expose the “sound” timber.

  4. The joints are cleaned and any rotten wood is routed out.

  5. Occasionally, new timber is spliced in or replaced where the existing timber is beyond repair.

  6. Our unique epoxy resin is used to fill the cavities and is moulded to match the existing profile of the timber.

  7. The sash and Frame are sanded or we burn the paint and always primed.

  8. The windows are then upgraded by fitting Brush Parting bead and draughts proof Sealing System

  9. The window is finished and painted by Dulux Weathershield Exterior paint.

  10. Sash cords or chain & pulleys are replaced, New Hardware Fitted and the sashes correctly balanced to ensure smooth operation of the windows.

Our installer teams are friendly and highly skilled, and always treat your home as they would their own. This means they will lay down dust sheets and make every effort to minimise mess while repairing your sash windows.

Refurbishment Benefits

  • No more draughts

  • No more rattles

  • Reduced external noise levels

  • Improved insulation and thermal efficiency

  • Reduced dirt and dust

  • Correctly hung windows that operate smoothly

  • Extended window life

  • Improved security

  • Add value to your property

Our door and window repair services are excellent quality and value, but we will only recommend them to you if we believe they represent a good long-term investment. If your timber windows or doors are beyond repair we will always recommend partial or full replacement.

avoid of re-glazing existing windows

Many want to know if they can have new double-glazed units fitted into their existing timber sashes. The advice is to be careful — these windows were never designed to take two panes of glass, each thicker & heavier than the original.

The glazing bars in old sash windows are often not deep enough to take sealed double-glazed units, which ultimately leads to premature misting. we can do but we not recommended !!

Another option is to have new sashes made to fit your existing frames and to match the originals. London Joinery Services uses new slim glazing units and traditional methods of carpentry for an authentic look.

For more information please contact us 

Costs of window sash replacement

Prices will vary based on the extent of the damage also It depends on how much work each window needs:


  • For a recondition and new draught seals (this included stripping, priming and painting) = costs approximately £400-£600 per window inc Frame & Architrave.

  • Double-glazed sash replacements only, to fit into existing frames = approximately £500 per sash


This is just an estimate though, and we do offer a free no-obligation survey and quotation so we can come and see the windows and talk you through our service and the best options available to you. Our quotation gives you a full price breakdown, window by window.

We work on any type of timber windows and doors, also we work on Mezzanine or balcony whatever manufacturing or repairs. Such diversification and decades of experience have made us the UK’s leading period joinery specialists.



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What area do you cover ?

we cover many areas of Greater London & St Albans, Hemel Hempstead, Hatfield, Potters bar, Cheshunt, Harlow.

Do you offer a free survey ?

Yes. A free survey is available to all customers.

Do you provide a written quotation ?

Yes. After our own site inspection and discussing the requirements of our clients, we provide a written detailed quotation of the service our customers will get.

What is your lead time for new joinery or replacement sash windows and doors ?

For items which we supply and fit our lead time on all products is between 3 to 7 weeks, and depends on how busy we are (during the busy summer months our lead times can stretch). the lead time only begins once a Purchase Agreement has been signed and your deposit has been received.

Are your new double glazed sash windows and doors fully compliant with the building regulations ?

Yes. Our complete new windows and doors comply with Document “L” building regulations. New windows and doors fitted into their existing frames do not have to comply as this type of work is classed as refurbishment.

Can you match the style of my windows ?

Yes. We are able to match and replicate the existing features of period sash windows and doors and any architraves.Sashed can usually match any existing windows. We just need pictures of the existing windows to kick the process off.

Which is better, repair or replace ?

Repair is cheaper in the short term but may not provide the best long term solution.

How much will it cost to renovate my windows?

It depends how much work each windows needs but standard draught proofing without replacing rotten sills, glazing etc starts at approximately £350 per window. For a more accurate quote please call us on 0800 130 3003 to arrange a free no obligation survey.

How long will my window renovation take?

The time taken will vary depending on the survey result. Typically we work to a one window per day time scale although this can be adjusted if necessary to suit your requirements.

Is it possible to install double glazing into my original sash windows?

This depends entirely upon what type & conditions of window you have, however we have developed a service that will more than likely meet your requirements, namely by replacing your existing moving sashes with new, slim double glazed replicas into the original box frames. Find out more here.

How does the renovation improve comfort levels?

The main complaints we hear about are draughty, rattling windows. Our draught proofing system closes the gap around the sashes, eliminating draughts, rattles and reducing dust ingress and heat loss.

What wood types do you offer and what should I choose?

We use a variety of timbers. All are FSC certified. In most cases we use Hardwood red meranti but we do manufacture doors and windows out of a wide selection of hardwood or softwood. If you have a preferred timber choice please talk to us.

Will there be much disruption during the works ?

Whilst your windows are being refurbished / replaced a small amount of disruption due to noise, dust and opening to the items is unavoidable. However, great care is taken to ensure disruption is always kept to a minimum. After completion of the works, the room will be vacuumed and left tidy.

Do your replacement windows/doors add value to my property ?

Yes. Without a doubt by installing traditional double glazed timber windows you are adding more value to your property than the cost of the refurbishment project.

Will I need Scaffolding erected during the works ?

Generally most installations / refurbishment works do NOT require Scaffolding as all works can be done from inside of the property, If scaffolding is necessary we will always discuss this with you in advance of the order being placed.

How do I know I’m getting a good price ?

We guarantee to beat any quote on a like for like basis. Let us prove it!

How long are your product guarantees?

We provide 10 year guarantee on our work across all products which have been installed by Design Build Joinery. Supply only customers enjoy five years.

I want to replace my windows but live in a conservation area. Do I need permission?

This depends on a number of factors, like your property type (flat or house). If you are replacing like for like, then you usually do not need planning permission but you should speak to your local authority.

I live in a listed building can I change my windows?

It is not usually possible to change your windows in a listed building unless they are beyond economic repair.

Where are your windows & doors made?

All of our new windows and doors or stairs are manufactured by our expert craftsmen in our workshops in North London. If you would like to visit our workshops to see the windows being made, please contact us on 0800 130 3003 to arrange an appointment.

What happens if I find a fault after you leave?

We have an excellent aftersales service. Please contact a member of our team on: 0800 130 3003. We will then work with you to rectify the problem as soon as possible.

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